Windows Update 800B0109 Error

Windows Update 800B0109

Windows Update 800B0109 Error usually happens when your Windows update components are corrupt or when there is a Malware infection. Trojans that infect Windows Update 800B0109 are versatile malware programs and can be used for data theft, Ransomware distribution, system corruption, and more.

Windows Update 800B0109 Error

The Windows Update 800b0109

There are many different symptoms that can be associated with a Trojan Horse infection. One of the most typical ones are BSOD crashes and frequent errors that seem to occur for no apparent reason. Screen freezes and an overall slow-down of the system are also possible when there’s a Trojan in the computer. However, all of these symptoms are quite generic and can be associated with a number of other problems as well. For instance, hardware issues such as bad RAM sticks or some problem in the hard-drive can also trigger similar issues. 


Other more specific red flags you can expect from a Trojan like the newly released Windowsupdate_800B0109 are modified or corrupted files or programs, deleted or moved files, inability to open some of your data due to encryption, and even alert messages that aren’t coming from your actual antivirus and which warn you about a virus infection in your computer and try to get you to purchase some obscure security program in order to “secure” your computer. All of those and many more symptoms might show up if you have a Trojan threat like Windowsupdate_800B0109 in your system. The symptoms typically depend on what the Trojan is actually being used for. Note that in some instances, there may be no symptoms whatsoever. For example, if the virus is used as an espionage tool, you are unlikely to notice any strange or questionable activities in your system. In other cases, the infection signs might be all over the place, but you might not be able to do anything about them. Some Trojans, for example, are known for blocking the antivirus in the system, and also for preventing the installation of new security programs. In such cases, it might seem that there’s nothing you could do to deal with the infection. However, even if the situation looks really bad, there are still steps you can take to ameliorate it, and we are about to tell you about those steps.

The error 800B0109 

Regardless of what a Trojan like the error 800B0109 is trying to achieve – to steal your banking credentials, to insert Ransomware in your system, to use your computer as a cryptocurrency mining tool, or something else, you must not give it any time to complete its task. The quicker take actions against the error 800B0109, the greater your chances of bringing things back to normal are.

The first thing you need to remember if Windows Update 800B0109 is currently messing with your computer is to stay calm. We know that it could be quite stressful when you realize that your computer has been infected and that your whole virtual privacy might be at risk, but panicking won’t get you anywhere. However, this doesn’t mean you should be careless with the removal steps we are about to present you with – follow them carefully, and only delete what you are certain belongs to the malware. If you have any doubts about a given piece of data, ask us in the comments if it really needs to be deleted. Note that deleting something you aren’t supposed to may cause just as much harm as the virus infection (if not more). Also, in case you really don’t think you can take care of this problem yourself, try the recommended removal tool you will find in the guide – it is tested against such threats and should be able to quickly resolve the Windows Update 800B0109-related problem you are currently struggling with.


Name Windows Update 800B0109
Type Trojan
Danger Level High (Trojans are often used as a backdoor for Ransomware)
Symptoms Trojans can cause various symptoms such as crashes to BSOD, increased RAM and CPU use, data corruption, errors, and more.
Distribution Method Trojans are oftentimes disguised as regular software and uploaded to file-sharing sites.
Detection Tool  

Remove Windows Update 800B0109 Error Code

If you have a Windows virus, continue with the guide below.

If you have a Mac virus, please use our How to remove Ads on Mac guide.

If you have an Android virus, please use our Android Malware Removal guide.

If you have an iPhone virus, please use our iPhone Virus Removal guide

Windows Update 800B0109 Error

Some of the steps will likely require you to exit the page. Bookmark it for later reference.

Reboot in Safe Mode (use this guide if you don’t know how to do it).

Windows Update 800B0109 Error


Press CTRL + SHIFT + ESC at the same time and go to the Processes Tab. Try to determine which processes are dangerous. 

Windows Update 800B0109 Error

Right click on each of them and select Open File Location.

After you open their folder, end the processes that are infected, then delete their folders. 

Note: If you are sure something is part of the infection – delete it, even if the scanner doesn’t flag it. No anti-virus program can detect all infections. 

Windows Update 800B0109 Error

Hold together the Start Key and R. Type appwiz.cpl –> OK.

Windows Update 800B0109 Error

You are now in the Control Panel. Look for suspicious entries. Uninstall it/them. If you see a screen like this when you click Uninstall, choose NO:

Windows Update 800B0109 Error

Windows Update 800B0109 Error

Type msconfig in the search field and hit enter. A window will pop-up:

Windows Update 800B0109 Error

Startup —> Uncheck entries that have “Unknown” as Manufacturer or otherwise look suspicious.

  • Remember this step – if you have reason to believe a bigger threat (like ransomware) is on your PC, check everything here.

Hold the Start Key and R –  copy + paste the following and click OK:

notepad %windir%/system32/Drivers/etc/hosts

A new file will open. If you are hacked, there will be a bunch of other IPs connected to you at the bottom. Look at the image below:

Windows Update 800B0109 Error

If there are suspicious IPs below “Localhost” – write to us in the comments.

Windows Update 800B0109 Error

Type Regedit in the windows search field and press Enter.

Once inside, press CTRL and F together and type the virus’s Name. Right click and delete any entries you find with a similar name. If they don’t show up this way, go manually to these directories and delete/uninstall them:

  • HKEY_CURRENT_USER—-Software—–Random Directory. It could be any one of them – ask us if you can’t discern which ones are malicious.
    HKEY_CURRENT_USER—-Software—Microsoft—-Windows—CurrentVersion—Run– Random
    HKEY_CURRENT_USER—-Software—Microsoft—Internet Explorer—-Main—- Random

If the guide doesn’t help, download the anti-virus program we recommended or try our free online virus scanner. Also, you can always ask us in the comments for help!


About the author


Brandon Skies

Brandon is a researcher and content creator in the fields of cyber-security and virtual privacy. Years of experience enable him to provide readers with important information and adequate solutions for the latest software and malware problems.


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